fix(s3-deployment): Source.jsonData() fails with null JSON values

[Lukanite]

In cdk-lib aws-s3-deployment, creating a Source.jsonData() will fail if the JSON has any null fields in it due to escapeTokens trying to build an object from it, resulting in TypeError: Cannot convert undefined or null to object

Issue # (if applicable)

Closes #36052.

Reason for this change

Can't create a Source.jsonData() when null values are present in the JSON data itself

Description of changes

Added a null check around escapeTokens() to prevent it from trying to process null values

Describe any new or updated permissions being added

N/A

Description of how you validated changes

Tested by hand via modifying the compiled JS in my project to add the check, and was able to successfully upload a JSON file to S3 with a null value contained inside. Also added coverage via unit tests/integration tests for the PR build to chew through.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[aws-cdk-automation]

(This review is outdated)

[Lukanite]

Thanks @pahud for kicking off the PR build, I'm committing these changes from another machine that isn't set up yet. I see the style errors, will address and update the commit shortly!

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

[Abogical]

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof#typeof_null

Javascript, wth. 🤦

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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[leonmk-aws]

Thank you @Lukanite for reporting the issue and fixing it so quickly !